144991 has 12 divisors (see below), whose sum is σ = 184680. Its totient is φ = 112560.
The previous prime is 144983. The next prime is 145007. The reversal of 144991 is 199441.
144991 is a nontrivial binomial coefficient, being equal to C(539, 2).
It is not a de Polignac number, because 144991 - 23 = 144983 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (144931) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 405 + ... + 673.
It is an arithmetic number, because the mean of its divisors is an integer number (15390).
2144991 is an apocalyptic number.
144991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
144991 is the 538-th triangular number.
144991 is the 180-th centered nonagonal number.
144991 is a deficient number, since it is larger than the sum of its proper divisors (39689).
144991 is a wasteful number, since it uses less digits than its factorization.
144991 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 294 (or 287 counting only the distinct ones).
The product of its digits is 1296, while the sum is 28.
The square root of 144991 is about 380.7768375309. The cubic root of 144991 is about 52.5347917532.
It can be divided in two parts, 1449 and 91, that added together give a triangular number (1540 = T55).
The spelling of 144991 in words is "one hundred forty-four thousand, nine hundred ninety-one".
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